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  1. or download this
    first_couple  {$a != $b}  0 ..9
any_couple ...
map_couple ...
...
  2. or download this
    map_ante { $_ == $^PRE ? $_ : () }
grep_ante
...
  3. or download this
    xgrep { $_ == 9 }     LIST  # like ordinary grep 
xgrep { $a == $b }    LIST  # like grep_couple
...
xgrep { $a == $^PRE } LIST  # ERROR
 
xfirst ...                  # and so on